View Compilation Error

0_0_18807469_1399.cpp: In function 'int main()':
0_0_18807469_1399.cpp:5:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&n)!=EOF)
                        ^
0_0_18807469_1399.cpp:5:27: error: 'EOF' was not declared in this scope
     while(scanf("%d",&n)!=EOF)
                           ^
0_0_18807469_1399.cpp:11:50: error: 'printf' was not declared in this scope
             if(c<a+b&&a<b+c&&b<a+c)printf("YES\n");
                                                  ^
0_0_18807469_1399.cpp:12:31: error: 'printf' was not declared in this scope
             else printf("NO\n");
                               ^